This mountain bike rear derailleur pulley is an essential accessory for cyclists seeking precision and reliability. The sealed bearing construction ensures stable performance and minimal maintenance. Its wide teeth design allows for better chain engagement, reducing the risk of slippage and enhancing overall riding experience on rugged trails. Features -Color:Black -Material:Plastic -Size:6.00X6.00X1.50cm/2.36X2.36X0.59in -Smooth gear transitions: optimized for 6/7/8 speed systems, providing seamless shifting for an enjoyable cycling experience -High performance: constructed from durable materials to withstand wear and tear, making it suitable for extended rides and rough terrains -Accurate chain alignment: engineered to reduce chain , safeguarding the transmission system and ensuring a stable ride -Enhanced speed and control: lightweight construction helps decrease the bike's overall weight, boosting speed and maneuverability for all types of outdoor exploration -Userfriendly installation: designed for easy compatibility with various mountain bike models, facilitating simple adjustments or replacements for diverse rider preferences Package list: 10 x Rear Derailleur Pulley Wheel